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Planets
2018 review for planets quiz
| Term | Definition |
|---|---|
| Inner Planets Common features: | Mercury, Venus, Earth, and Mars Small and dense Rocky surfaces “Terrestrial” planets Solid surfaces All have an atmosphere (EXCEPT Mercury) |
| Sun | Center of our solar system (Heliocentric model) Star |
| Mercury | Smallest and closest to the sun About the size of earth’s moon Scarred by craters on the surface Virtually no surface Small mass = weak gravity Side facing sun very hot, side away very cold (extreme temperatures) Can not support life |
| Venus | Second planet from the Sun Called “Earth’s twin” because of similar size and mass Thick atmosphere; always cloudy Unusual pattern of rotation Hottest planet of the Solar System Surface is covered in rock, volcanoes Can not support life |
| Earth | 3rd planet from Sun Only planet where you could live easily Liquid water Suitable temperature ranges Atmosphere Oxygen |
| Mars | 4th planet from the sun “Red planet”: iron oxide in rocks Water Atmosphere is 95% carbon dioxide Surface Moons: Phobos and Deimos |
| Asteroid belt: | Separates inner planets from outer planets Jupiter, Saturn, Uranus, Neptune |
| Outer Planet common features: | Larger and more massive than inner planets No solid surfaces “Gas giants” Strong gravitational force (keeps gases from escaping and forming a thick atmosphere) Extremely cold: because so far from sun Many moons Surrounded by a set of rings |
| Jupiter | 5th planet from the sun Largest and most massive planet Thick atmosphere Great red spot (A storm larger than Earth; swirling winds similar to a hurricane (shows no signs of going away) Largest moons (Ganymede, Callisto, Io, Europa |
| Saturn | 6th planet from sun 2nd largest planet Also contains clouds and storms “Ringed Planet”: made of chunks of rock & ice in its own orbit around Saturn; broad & thin Titan-largest moon; only moon with a thick atmosphere Lowest density of any planet |
| Uranus | 7th planet from the sun Blue-green in color because of methane gas in atmosphere Thin, flat rings 5 largest moons have icy, cratered surfaces At least 27 moons! Axis of rotation is tilted at an angle of 90 degrees (see pg 256) Rotates top to bottom |
| Neptune | 8th planet from the sun Similar in size & color to Uranus (Blue-green because of methane gas) Atmosphere contains visible clouds Great Dark Spot (1989); gone 5 years later; has had multiple other dark spot storms At least 13 moons: largest is Triton |
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AvniArora
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